feat: workspace aliases, tab groups of split panes, native path picker (v2.1.0)

- /api/workspaces and `agenthub workspace(s)` / `--workspace` as aliases of
  /api/lanes and `agenthub lanes` / `--lane`; old names print one stderr note.
  REPL `help lanes|workspace|workspaces` resolves through the aliases.
- A workspace holds up to ten sessions (slots 0-9); every console tab is a
  group of 1-4 split panes (PaneGroups, agenthub.workspace.paneLayout);
  parseGroups keeps the stored active tab when an earlier one is dropped.
- Browse button beside path fields: POST /api/lanes/pick-path opens the OS
  picker on the server's desktop — loopback only and no forwarding header
  (EREMOTE), a display failure is ENODIALOG not a Cancel, the dialog is
  killed when the request closes, a folder field falls back to the in-app
  browser on any failure.
- Changes rail counts chip, image viewer (/git/raw), status bar session
  counts and per-day cost (`date=` on /api/pricing/cost).
- /agenthub-open and /agenthub-doctor run from the INSTALLED build
  (supersededBy), doctor offers fixes behind two confirmations; plugin-open
  treats a locked bootstrap as non-fatal.
- New-terminal shell waits for the first attach (issue #55).
- repo-onboarding / debug-live-issue skills removed.
- OpenAPI: pick-path, lane/date on /pricing/cost, tool on /run/history,
  /api/workspaces mount.

server/lib/dashboard-runs.js

@@ -68,6 +68,14 @@ const listByLaneStmt = db.prepare(`
   LIMIT @limit
 `);
 
+const listByLaneToolStmt = db.prepare(`
+  SELECT ${RUN_COLUMNS}
+  FROM dashboard_runs
+  WHERE lane_id = @laneId AND tool = @tool
+  ORDER BY started_at DESC
+  LIMIT @limit
+`);
+
 const getStmt = db.prepare(`
   SELECT ${RUN_COLUMNS}
   FROM dashboard_runs WHERE id = @id
@@ -144,10 +152,12 @@ function patchRun({ id, sessionId, status, exitCode, endedAt }) {
   }
 }
 
-/** @param {{limit?: number, laneId?: number|null}} [opts] laneId narrows to one lane's runs. */
-function listRuns({ limit = 50, laneId = null } = {}) {
+/** @param {{limit?: number, laneId?: number|null, tool?: string|null}} [opts]
+ *  laneId narrows to one lane's runs, and tool (with a laneId) to one tool's. */
+function listRuns({ limit = 50, laneId = null, tool = null } = {}) {
   try {
     const safeLimit = Math.max(1, Math.min(500, Math.floor(Number(limit) || 50)));
+    if (laneId != null && tool) return listByLaneToolStmt.all({ limit: safeLimit, laneId, tool });
     if (laneId != null) return listByLaneStmt.all({ limit: safeLimit, laneId });
     return listStmt.all({ limit: safeLimit });
   } catch {